Alert archive / Colorado / Mesoscale Discussions in 2008

Mesoscale Discussion 2337

October 21, 20089 counties in Colorado; 4 counties in Kansas

The Storm Prediction Center issued this mesoscale discussion at Oct 21, 2008, 2:34 PM MDT for 9 counties in Colorado; 4 counties in Kansas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Oct 21, 2008, 2:34 PM MDT (20:34 UTC)
Expired: Oct 21, 2008, 4:00 PM MDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Cheyenne County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Sherman County, KS, Wallace County, KS

The radar

The Goodland radar (KGLD), 95 km from the middle of the area, began a volume at 20:33 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 920Oct 21, 4:25 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.6 hours before the alert went out and 246 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 496 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 373 m²/s²
0-3 km storm-relative helicity: 438 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 21, 4:24 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Kiowa, Kit Carson, Prowers and 1 more	8 hr

Nearby

Mesoscale Discussions in Colorado, 2008 Mesoscale Discussions in Kansas, 2008 Every mesoscale discussion in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.